Prevent user from copying text on mobile browsers

Question

I\'m trying to develop a typing speed competition using JavaScript. People should write all the words they see from a div to a textarea.

To prevent cheating (like copyin

Answer 1

A good way to work out if a user is cheating is to compare the current input length to the last input length. You can use a data attribute to store the previous value (or length):

jQuery:

$(document).on('input', '.typing-only', function(){
    if((this.value.length - 1) > $(this).data('temp').length){
        alert('Cheat!');
    }
    $(this).data('temp', this.value);
});

JSFiddle demo